Top Alcohol racing is a lot like a three legged stool. We have money in, money out and crowds. But on our stool if we fix either of two legs the other one fixes itself. Bigger crowds, better promotions means more sponsors which means more money in. Less money out equals rev limiters to limit engine damage which also limits oildowns. Better crowds means better purses. An over simplified answer is marketing and rev limiters. My father had an apple orchard, he was required to belong to the Washington State Apple Commission which was essentially a marketing organization for selling WA state apples everwhere in the world.